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As a single nerve, anterior to the piriformis muscle
68%
3157/4627
As a single nerve, posterior to the piriformis muscle
24%
1122/4627
As two branches, both anterior to piriformis muscle
4%
164/4627
As two branches, one anterior to piriformis and one through the piriformis muscle
2%
75/4627
As two branches, both posterior to the piriformis muscle
90/4627
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The most common anatomical pattern is a single sciatic nerve which passes anterior to the piriformis muscle, however it is important to note that there are other common anatomical variants. Pokorny et al in a study of 91 cadavers found atypical anatomy of the sciatic nerve in almost 21% of cases. The normal anatomy seen in 79% is a single sciatic nerve exiting underneath (passing anterior) to the piriformis. The most common variant, seen in 14%, is the sciatic nerve splitting proximal to the piriformis with one branch passing anterior to and one branch passing through the piriformis. Illustration A is an anatomic drawing of the sciatic nerve passing anterior to the piriformis.
3.5
(28)
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